
Proxiblog has published articles about each of these altered coins. This is a roundup with die markers and links. Read the summary and then, for more knowledge, access the article.
1909-S V.D.B. Lincoln Cent
The “S” is added to common 1909 Philadelphia cents. This is the No. 1 faked coin.
We need some background on why this coin is valuable and how decisions by the US Mint created opportunities for counterfeiters.
Secretary of the Treasury Franklin MacVeagh disliked the prominence of Victor David Brenner’s initials on the reverse and stopped production in August of that year, removing initials entirely on the remaining 1909 and 1909-S cents. That is why you only find the initials on some 1909 and 1909-S examples. In fact, those initials did not appear again until 1918 when the VDB appears below Lincoln’s shoulders. That’s how angry MacVeagh was. But he wasn’t thinking about counterfeits at the time even though his actions inadvertently made altered dates easy.
Scammers realized they stood to make big profits merely by adding:
An “S” to a 1909 VDB cent.
VDB to a 1909-S cent.
An “S” and “V.D.B” to a 1909 cent.
You can find that history along with die markers in “Identifying Fake 1909-S Cents.”
Excerpt:
Now compare mintmarks with a genuine, added mintmark and cast replica mintmark:

1916-D Mercury Dime
Scammers add a “D” mint mark to a 1916 Philadelphia dime. It is one of the second frequently faked coins, after the 1909-S VDB. You can also find them in fake PCGS and NGC holders. There are replicas, too. And more.
Learn about all the ways scammers are altering or faking this rarity. See: “Deceptive 1916-D Dimes” by counterfeit expert Jack D. Young.
Excerpt:
As Jack always says when reviewing a subject coin, ATTRIBUTION is the key! And with help from a few friends he pulled this template together of the 4 known reverses/mint-mark positions and shapes for use in evaluation of the 1916-D. He also has added this fake example in the middle of the template for a good comparison of good versus bad.

Template of four good mintmark positions and bad one in the middle.
Jack is one of the top counterfeit detectives in the country. Read the aforementioned article to become familiar with his methods.
1914-D Lincoln Cent
Scammers alter 1944-D cents, shaving down the first “4” to make it look like a “1.”
The most counterfeited coin is the 1909-S VDB; but the 1914-D Lincoln Cent actually has a smaller surviving population. This makes the 1914-D a prime target for counterfeiters.
You can read about the scammer’s methods in “Fake 1914-D Cents.”
Excerpt:
Look for a large gap between the “9” and the second “1” in date. 1944-D cents are commonly altered to appear as 1914-D cents, but this leaves too much space between the first two digits and the last two digits.
See this example from NGC:

You can also find telltale markers on genuine coins in the aforementioned article.
1932-D and 1932-S Washington Quarters
Common 1932 quarters are altered with an added “D” or “S” mintmark.
The 1932-D Quarter (436,800 minted) and 1932-S Quarter (408,000, lowest mintage in the series) are a coveted pair for collectors. The 1932 Philadelphia Quarter has a mintage of 5,404,000 with no mintmark, of course, on the reverse, making it a target for added mintmark fakes.
You can see how scammers add the mintmark as well as become familiar with die markers.
Except:
The most obvious die marker for a genuine coin concerns the filled mint mark (“D”) with visible serifs and bloated appearance, even in uncirculated grade.

Here’s how the mintmark looks in more common circulated grades (note you can see still serifs).

You should also look for die cracks on the reverse, especially near the eagle’s left wing or the motto “PLURIBUS.” Many but not all display this.
Go to the article to see the 1932-S die markers.
1943 P/D/S Copper Cent
Steel cents from this year are often copper-plated or the date is altered on a 1948 or 1949 cent.
You’ll also find replicas on Temu and Etsy shopping sites.
Approximately 40 copper-alloy cents were accidentally minted across all three U.S. Mints (Philadelphia, Denver, San Francisco) in 1943. The 1943-D is the rarest (1 known), while 1943-S (San Francisco) is exceptionally rare (fewer than 5 known). Some 20+ 1943 cents are said to exist.
There are distinct die markers for all three cents. You can read about them in “Counterfeit 1943 Copper Cents.“
Excerpt:
Simple detection methods include using
- A magnet. If the coin sticks to it, it isn’t copper.
- A coin scale to see if your specimen weighs 3.1 grams. (Steel cents weigh 2.7 grams.)
- A lupe to view the date and to detect if it has been altered.
Here’s an example of a 1948 cent altered to look like a 1943 copper cent weighing 3.1 grams and passes the magnet test:

Go the article to see the die markers of each copper cent. You’ll also learn to identify replicas.
1989-CC Morgan
Fortunately, the 1889-CC Morgan dollar has only three known major die varieties (VAMs), each with specific die markers. This makes it easier than other dates with more markers when identifying counterfeits.
The most common practice is to add a CC to the common 1889 Philadelphia Morgan. That is why knowing the die markers for authentic coins is so important.
You can read about all the die markers in “Identifying Counterfeit 1889-CC Morgan Dollars.”
Excerpt:
A mere 350,000 coins in 1889 were struck at the Carson City Mint, and hundreds of thousands of those were melted after 1918 due to the Pittman Act. This makes it a nifty target for criminals. Moreover, the common date 1889 Philadelphia is used for an added mintmark. Here is an example from NGC:

Right off the bat, veteran hobbyists know that the mintmark used in the above example is the wrong one for an 1889-CC dollar. Scammers typically take the “CC” from a lesser value 1878-CC dollar.
Let’s start there by showing the mintmark of an 1878-CC and 1889-CC Morgan:

The aforementioned article also discusses the VAMs of genuine 1889-CC Morgans. You will want to know those, too.
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